Several days ago, I started a series of rumor posts on my personal Google+ account discussing some Android rumors I felt were interesting enough to share, but didn't feel confident enough yet to do so here on the site. The posts were heavily prefixed with disclaimers that none of them may turn out to be true but that I had a certain level of confidence to talk about them in public unofficially.

Disclaimer: No matter the confidence level, there's always a chance product updates, features, and some or all details will be changed or cancelled altogether. As with all rumors, nothing is 100% until it's officially announced.

We do not have possession of any APKs or unreleased devices, so please don't ask for them.

Confidence level

Based on everything I've seen so far, I'm assigning this rumor a score of 9 out of 10. I'm docking a point due to the lack of the release timeline. As far as rumors go, it's almost a sure thing.

The rumor

Hangouts, which has so far only successfully unified Google+ Messenger and Google Talk, leaving Messaging and Voice to co-exist, is finally getting SMS and MMS integration. According to sources familiar with the matter, the upcoming Hangouts version 1.3 has these features enabled and, furthermore, also allows sharing of videos via the Hangouts protocol.

Messages sent via SMS will show "via SMS" next to the timestamp so that you can always figure out the protocol used for each message delivery. You can request delivery reports for sent SMSes - a feature that is part of the SMS protocol that some of you may be using regularly (though if you are, please don't text meUpdate: I was actually thinking read receipts, which are apparently different from delivery confirmations and don't bug the recipient).

MMS picture messaging is supported as well, though I can't confirm sending of video via MMS at this time. There is a settings menu for wireless alerts as well as a toggle for auto-retrieving messages while roaming. Finally, you can opt out of SMS via Hangouts altogether.

Originally, I suggested that the stock Messaging app may be going away in favor of Hangouts, at least on Nexus devices. I am unable to confirm it at this time and won't be able to until we see final KitKat software. However, if I were to speculate, I would suggest that the Messaging app will remain in AOSP, but Nexus devices will skip it and ship with just Hangouts pre-installed. Once again, this part is speculation on my part.

Release timeline

I have no information at this point about a possible release timeline and correlation between KitKat and this Hangouts update. It's possible that Google will roll it out before KitKat but it's equally as possible for it to come out later if it's not fully baked just yet.

Evidence

We were sent several screenshots that support the above rumor and show the settings menu as well as a sample SMS conversation:

Mockup

Today, we were able to obtain some pretty compelling evidence, seen above, but we may not be able to post screenshots or photos for every future rumor.

Because of this, we're going to attempt to add mockups to illustrate such rumors instead of having you stare at a wall of text. This is one such mockup, created by our own +Liam Spradlin, based on the image above and using the previous leaked off-white KitKat colors in the notification area - consider this a practice round:

Mockup of the Settings screen in Hangouts 1.3

Other thoughts

When Google releases Hangouts 1.3, what used to be this before Hangouts: